<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="demo14.js"></script>
</head>

<body>
    <form action="">
        <input id="username" type="text" name="username" value="66666" placeholder="请输入用户名" />
        <br>
        <input type="password" name="password" id="password">
        <br>
        <button type="button">登录</button>
    </form>

</body>

</html>